As the environmental problem gets increasingly worse, clean energy has become a major concern for many countries. /VCG Photo.

Workers are working on a new wind power plant in Shuangfeng County, central China's Hunan Province. Their daily work includes climbing up mountain slopes, setting up windmills and lining up the system to generate power. And of course, working at height over 100 meters above the ground is part of the job. /VCG Photo.

As the first such project in the county, the construction of the Shuangfeng wind power plant, worth about 430 million yuan (63 million US dollars), is nearly completed. Twenty-five windmills and related facilities are expected to be put into operation in September, with an annual output value of 60 million yuan (nine million US dollars). /VCG Photo.

Wind power was recognized as one of the most cost-effective and practical forms of clean energy. As predicted by the Bloomberg New Energy Finance, solar and wind energy would take up half of the power generated worldwide by 2050. /VCG Photo.